EP 0236833 A3 19891115 - METHOD AND APPARATUS FOR THE AUTOMATIC ANALYSIS AND RECOGNITION OF A TELECAST ENCRYPTION CODE
Title (en)
METHOD AND APPARATUS FOR THE AUTOMATIC ANALYSIS AND RECOGNITION OF A TELECAST ENCRYPTION CODE
Publication
Application
Priority
CH 95986 A 19860307
Abstract (en)
[origin: EP0236833A2] The method consists in evaluating the shift applied to a certain number x of successive lines of the encryption cycle, then in looking up in a table the unique encryption code which, at this position of the cycle, gives the sequence found for the x shift values. In order to analyse the shift in each of these x lines, the method consists in firstly evaluating the relative shift of each of the x-1 lines in relation to the first, by studying the relative shift of a given brightness transition present in all of these x lines and which, before encryption, reflects a detail vertical to the picture, then, secondly, in evaluating the absolute shift of each of these x lines by comparison with a line from the x to which a minimum shift has been applied on encryption.
IPC 1-7
IPC 8 full level
H04N 7/169 (2011.01)
CPC (source: EP)
H04N 7/1693 (2013.01)
Citation (search report)
- [AP] DE 3600326 A1 19860710 - TECHNICAL DEVELOPMENTS & INVES [LI]
- [AD] FR 2524242 A1 19830930 - RADIOTECHNIQUE [FR]
- [A] US 4338628 A 19820706 - PAYNE ROBERT W, et al
- [A] FR 1069611 A 19540709 - ZENITH RADIO CORP
Designated contracting state (EPC)
BE DE ES GB IT LU
DOCDB simple family (publication)
EP 0236833 A2 19870916; EP 0236833 A3 19891115; CH 666775 A5 19880815
DOCDB simple family (application)
EP 87102565 A 19870224; CH 95986 A 19860307